Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 361	$ 163	$ 313
Other comprehensive income (loss), net of tax
Currency translation adjustments, net of tax of $33, $(9) and $(22), respectively	110	41	(131)
Available-for-sale securities:
Net unrealized gains (losses) on available-for-sale securities, net of tax of $(1), $(1),and $1, respectively	1	1	(2)
Cash flow hedges:
Net unrealized holding gains (losses), net of tax of $0, $(1), and $4, respectively	1	0	(6)
Reclassification of cash flow hedges to earnings, net of tax of $(2), $(2) and $(3), respectively	2	4	5
Minimum pension liability adjustment:
Pension and post-retirement benefits, net of tax of $(4), $21 and $(1), respectively	11	(57)	6
Reclassification of pension and post-retirement benefits to earnings, net of tax of $(3), $(2) and $(2), respectively	5	4	3
Other comprehensive income (loss)	130	(7)	(125)
Total comprehensive income	$ 491	$ 156	$ 188